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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0f827eae07d28fa2735ddfbaeb3a26635e00d43209895ec902e452ef08ed614' 
  AND token = 'wZRTRDMaj/1WEl+bs0fKR9v0iyAYiEqNX93GjALK02g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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