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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '933650556966755b60562b2d187e796bf8886834f89ada881b03ed41c7675df6' 
  AND token = 'docjEhauYhwZzShQfI5nB2Z3uj4Ry6mSVKCXL3td07A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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