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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9597599dd4b0303430b36354fdc043c319b50e4fca8ab55b654985d7292b6d2' 
  AND token = 'g+eArnkZFpf536+wa+ioBm9rhT8exvwlNMQCNMpKzm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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