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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9d58753c4e41a16f8f82ec0f273007c64635e4d0b2b010747472940a7dda019' 
  AND token = '7NjpF7wvtTmCI74i53gdbjanfOlHhKtxJJicJID9qVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00122

JSON explain

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