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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adbbb883cb0b899fd51f8847d1b70389b45ee6a31c0dd309943748a2f2ca48b3' 
  AND token = 'g7GdYCEW06KuRULR5TvUDd7AZA7P4a8KAkw5KkuvbAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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