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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a86e2d3256973b9058acfbf42310eda1a9a7c99dbbd8298304f0a351d316f852' 
  AND token = 'TwiuI4WlZkeO3L4EUof9OQlo+c3Undb4qJufLkzbyYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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