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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f06b8b2974a52d13423c01193bedd7f1602da339d4eeeb179475411fe89b6409' 
  AND token = 'lHFbHDqYqulC82zcQy6GSTB+GF+4sNGc3cy0b4cKtlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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