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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5ac0fe47aed8b83fce47b4e7df218d8c6980df51b9232f89787a74aba401bbb' 
  AND token = 'yP+/d1HsY10x2s+PrkcRFgD7i+fNgVQRbvv/drcmVdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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