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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4207ad0028bc6944477f1178e58ab49f895d358d6921796477c94d672cb0844b' 
  AND token = '1ZkshBOiJhhera1+asS4NdDx9joxVNxSVzHJ+WY+ftk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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