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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eebf72dc98c6c3d084941476bb501673caaa34b76bcd5d1db8c0edcc47d3e0bd' 
  AND token = 'spcOMVbu4Ci7EDt6Na+HtLwLGx60ZFZScE02+1lKHsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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