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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5e021c340fdbbc4a03b922d4f78873c0c9dea9d7b0a23e35c5f4c2d304c96cf' 
  AND token = 'DFw88yEsq41khrlgFE2njcu3TVMSLKS4hcqaKFyFdFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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