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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb912a7e49a6b2eaa88d1ecf1415b128ded37610e12a7fd94af710fa635556e7' 
  AND token = 'rYg1EbE6niBobR9AkTNwlNCQ42wyINMCggLukiQpbSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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