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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eba09164460556d795c4debf8e4b8c2670b7975ac3d4f930f80a5842ca3868af' 
  AND token = '/OeYd081Zgf6d2e0AUR0Qb8ZpHbSkOMNwbH9kjesfUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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