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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a108bcb1780b46983ec5c0c7c10d2a2bfa3034982ead83832832ca0d8d799942' 
  AND token = 'nKYq3x+rTk8DIcMPcoVYkyvel2pElea+n+BGn4nY6pU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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