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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dca71d6b14a1a97b2566dcaf9bf77eed6a85c76ae24a5ee454c15108271fac2' 
  AND token = 'nWTC4ha3p+FmuCRtr33HjmB2ykY26QMhzxlG05cPmaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}