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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e5934a37452c9a12d3952543329a82f700923e96d31eeadbdc953e5c519d278' 
  AND token = 'kaAcIZuwrlQW4/6yoSCKzXN1fCXwvx3wrGDcbAaIr1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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