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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a0143dd22702762a1d7dc67954d2995be355d23bc266bd7b74e13851d5d5903' 
  AND token = 'yVztYw77+6+O0Zzqpl1pfPyOPBtPtaK8buL9cdS9zkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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