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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a6fb7c3ba2ba0661ffa06d16b59313afe5b6a34b02875a80f55c0d710b9d42e' 
  AND token = 'TQGJdsvpW9TOx2AJI2+OUbBXkMIsLjHl+Ccr3VZB8Ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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