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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '530287c5248940fdeb8d18747cd43557fcabb1cb038f8cec8c2d6d94947e12d5' 
  AND token = 'RouT5gkrOb2Jj5+lCHhTeac9IcsxXC+rOb+I36Roum8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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