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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50ea94e4c5eb1d83a3d1f19b24640b4a36b2771107f8c1b274ebfc878875bacd' 
  AND token = 'TwB07mJlQg6PFdrw0NHearZNNGkcfBtKsSV8Fvn7Bh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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