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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdd74f13fe894ab6e0d74beda629ca17a1400d1448002ca643096ce4960b63f9' 
  AND token = 'frymZtSnts9rU8WjFS7GaHjnW0e9UA43DYe12ao5+WM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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