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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2139d8780d0d072a4fa580b826c7fcd328b2d3c6cdd7733732e89ec0dc669f74' 
  AND token = 'A3MLHdRx+25OmDEw6rO4ssxsymZ/IY0qF/o3JNg9htA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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