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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4cfd4021464428ca9cbe6bb1bb8593ee7d237c767e7853c7bcae9879ecd586b' 
  AND token = 'qoTY+JLkAnCR1iKid63CBPm/CUEh+7gtJu0W9afP5BE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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