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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0f7472e033717acf5fb27e87516c5071503576e16ab6595f8f6a986ac0e1e17' 
  AND token = '4e4NCR1EcTMx3FYvkasqLe2De06yY0csr4U82EEK+3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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