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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3274f2a4b435bcae07b0f31ca70e8a02651f28d785e779ee0b4d1a9656229c98' 
  AND token = '9zWARV4tuLR59PBWWPsT1cRuzqlWpcgGmcz76djeWR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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