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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ade46fd7954fb9c63821f180523d57eb98f9e5969ab1e9941de8716103476aa6' 
  AND token = '+jpigCKQ1LY9Bf6dFUB60Z1ytbk+1CIY9H7FkMxxenc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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