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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3f6abb59d2907545dba101389ffba75dd42c30bde1982d4fecf4362fb57b92a' 
  AND token = 'nrrHk6yoPHVXoBTyfJITGJBUPDwrSW2qkDtL+/SP5KE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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