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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0d0432a56c0c08a69824142d2ab46b5aa8a602b4c5f0dd35ed0c4555c8df505' 
  AND token = 'CTFQJmeFRLHiLO7vh/fX24BoXC0q9NjghaSp+Ahpe0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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