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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '073bf7b27de6d8b852e74de67300ef73b0d3a4cf428b9b9fe8b998ff94db4614' 
  AND token = '+hWysRMFJ1DPltCNRjm4iOWGjl8QpJ57goEWYPVFL58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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