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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ca9c9d04abe8065849b381509c8750babea324c5c35c48bf5a1f8de83b6efe7' 
  AND token = 'nJi56dz69s3kOkcSLrbJXKYuZSLh7P9ML7ocSqWA2WQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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