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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab942167876320b4c321c445665d4544250a67b03c8b663a3082b0d0a64606a5' 
  AND token = 'aJcCxIp1Sc36tKEfgdNoRfuF4NQXoJvCHeHhMgyEo6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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