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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd87c5b12c9ef5f2c02f4a1f3ee72d1e43d6c699652cfc6dfbae747f915ff7346' 
  AND token = 'j9ctiDbDMJBGswYmHCe0GH5xVbF1w+z4TSuUWX2w3yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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