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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62aaa91dc24b85847e9451757d4566a3ca48e4086908477994fb76b4e448ce3b' 
  AND token = 'pEQ572qNLeT8OzXZaX/sbe/tSIvoVvVGLdjc0sHrs60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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