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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fc468e3fe1f4c232ea9c7faf9d8e7d634712dc06eeee477161e377fccc92ee8' 
  AND token = 'htPREmF6MF+fK4knNH+r9uDh/35cZzjAUq9C1nl8Mec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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