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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b56918a606022ab70807b6711643f881bd759e235361cc957033c28efb0c176a' 
  AND token = 'qloFZ2oi0Y3p04Tsg4JtaFCjv1Bjdq+w/bxbfcL6HjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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