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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07048506291a14e7f26c440db0612b1d76337c639a6d8a40c96bf25ee36d7915' 
  AND token = 'OFoiaupjjgOwAcv+VHHPDm1jwY+TU28/Op13cPXEupU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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