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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc340e278930e0e08a5e918822a5020ad9c7d2630b28ae091f39621b46d88c3e' 
  AND token = 'i2Ky9RQ84GC2zoZ0xHukBrHXFd3hRcD1wDhztmWgMLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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