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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb52385bc7eada48503b3ea64f9879fe01c4a53730903cb2d06c2eb6d7380cfa' 
  AND token = 'fIm2uNgCywupL2Isf7aJpgRy44BeXjPf0X+k3lRaprA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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