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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2d7307207da47b5c166f732d9d19b44f376eb059cf95e42d30a5614688de514' 
  AND token = 'RbYfMkUQbAXmgweEtnnYp2PGDdwd4XVRvt+az3lQN40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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