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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e97a98e2f65953ac3c27f88fb085b7b7392adf3cfb124602b194e4bd98d3a292' 
  AND token = '3Wlkk4Gg6ck4iHJlpHV7o28e8P1CuIhk6zAUPjdyVMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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