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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baeb0f1e11340b739131fe0627eef10401bfb5bff143abec51c144d3e5f3c2a7' 
  AND token = 'avoa5RhR1G06Ecy2uWkBsio6qeIV3/eL1ogVGQs2ZSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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