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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3270d80f8ea7d2904a929800cfaa0290bf3a615724fb61ee7104f5d5951dd36' 
  AND token = '/F3Lad6/gohsiuhpso0LD/x67DFuKQvxUWInc5jFORI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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