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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '292c34938a03ac8d94025e8ecb5325f529e1151e057176eeeaecf4ce61b0ceac' 
  AND token = 'JHm99RkYKxX+o2AusBg4ghIlUfS2TOnNiij79d4BY3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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