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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbfcccf5db69350f27732a83e82267d83f912146f21fed37fd2b92c9487f2872' 
  AND token = 'o9Qmu4+B+W5zl+beK6/59Z5U6aAQngtCXN3Dezf+ja8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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