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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50aa5be0bcd9562c43b2b36e6168e8cd0c3e0289938a59921c1bf852e79c4eff' 
  AND token = '6p9i/hX8h+HaX3hNvujhiSrCQ2QPSvbNclvH0JBcNiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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