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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73fa1aea0b3eb10e0430386f8f95ab1e6248bb37e04cb822fa625a9630c217fa' 
  AND token = 'qShyJKy61VZk7MNEYoGfAi3bUu1OjHL/2RyXZe0w2ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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