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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '230ad62f1c47a867f934550fad338500fb34199c4a296f67c0c3d78a6c859f8b' 
  AND token = '73x678QvI351nkoASVRUsr4fIREm1Yd6HK1jnp6AnmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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