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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81715394465746b4444787ba15092376314b9488593a4dd2d39072d60e917168' 
  AND token = 'FqekrEPQpVNF3dA8BtWG5bbRHHqDiPbPSwEB1VCY4AY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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