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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aed461544240159907b2892f5b2ca39116abaeaec650421ac1ec3c61c16a77e0' 
  AND token = 'C4x/GPxy67Ki39pKa66KlD0p68JWCHuYvu1l0jcNP4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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