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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '757d30b80eb9de0abcd5cc98dd005c30eabbc7b0583a10e2573faba9078e77fb' 
  AND token = 'AMVWiTCVvgoCROypEBvtVtmX2QN/db4D2rRFAavDdrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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