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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '377fb09699cb06a51d063d00fce74e05a64ab729b0f5f5720cce033c696dc611' 
  AND token = 'CoikKUyn1IQuAY+y622MsHQYa6b1RZCOuKkdiuLnmA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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