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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a341bf19733bdecfd9ee646c45f383080419bfa2359c60d0d1d66ac91e5ef18' 
  AND token = '+kZuPXVtZPi4Nussy2SkuIfC1Bii4yGy+nGkZTGk1OA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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