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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccb64f5e523bafea59eb232a1cf4d58da6eaaca7d26b0a268e39eb5eec1f65bb' 
  AND token = 'kJMJCeUhM7Vx+ol1zlSUumszkrK1wfyTrXw0kP938WY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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