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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4dbe0add6ce6c5430d89ccc6c65c6bc7b524737b0d171fed9dd55de2e9cb2fb' 
  AND token = 'XC1GtwmV+oqa8zMTpHjeHGMM8lq2HXf9eMSC4fkVx/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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