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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44c4321d6eb0ce4a78cfad03fa007cf9833138d01d10bd26621c78f0aacd06c9' 
  AND token = 'Hhbvjm2G2/zWRIYPb8A4zBcoRDxWPuX9ehA1z7tygeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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