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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef74fc32f488a7f3c409bfa4e746585e174dd20e6b06ab45931ef85fbce0836b' 
  AND token = 'hEZvSK9kBNI1tMfqJerP/N/LifjG9pI2z6OhfMI3ArA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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